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Multifocal Atrial Tachycardia Multifocal Atrial Tachycardia (Example) Multifocal atrial tachycardia (MAT) is a tachycardic version of Wandering Atrial Pacemaker (WAP), which occurs when multiple areas within the atrium generate consecutive action potentials that are all conducted to the ventricles. Thus, each QRS complex will be preceeded by a P wave, however each P wave will have a different morphology since it is originating from a different area. By definition, WAP has to have at least 3 distictly different P wave morphologies and a ventricular rate of 60-100 per minute. The only distinguishing feature of Multifocal Atrial Tachycardia (MAT) is the ventricular rate which must be greater than 100 per minute. Again, if it is less than 100, then the rhythm is called WAP. |
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